CHAPTER 2: VEHICLE MAINTENANCE INSTRUCTIONSTM 9-2350-256-202-19 ELECTRICAL TROUBLESHOOTING-ContinuedAPU ENGINE OIL PRESSURE GAGE CIRCUIT--ContinuedWARNINGRemove all jewelry such as rings, dog tags,bracelets, etc. If jewelry contacts a metalsurface a direct short may result in instantheating of tools, damage to equipment, andinjury or death to personnel.F Reconnect wire 419 to panel connector side of 15 Acircuit breaker. Disconnect wire 419 from APU FUELSHUTOFF switch side of 15 A circuit breaker. Place redlead of multimeter on terminal of circuit breaker andblack lead to ground. Turn MASTER switch on andcheck for voltage. Turn MASTER switch OFF. If voltageis present, go to step G. If voltage is not present, replace15 A circuit breaker (see paragraph 13-7).G Reconnect wire 419 to 15 A circuit breaker. Disconnectwire 419 from circuit breaker side of APU FUELSHUTOFF switch. Place red lead of multimeter in wire419 and black lead to ground. Turn MASTER switch onand check for voltage. Turn MASTER switch OFF. Ifvoltage is present, go to step H. If voltage is not present,repair/replace wire 419 of APU fuel shutoff leadassembly (see paragraph 13-7).H Reconnect wire 419 to circuit breaker side of APU FUELSHUTOFF switch. Disconnect wire 421 from APU FUELSHUTOFF switch. Place red lead of multimeter onterminal of APU FUEL SHUTOFF switch and black leadto ground. Turn MASTER and APU FUEL SHUTOFFswitches ON and check for voltage. Turn MASTER andAPU FUEL SHUTOFF switches OFF. If voltage ispresent, go to step I. If voltage is not present, replaceAPU FUEL SHUTOFF switch (see paragraph 13-7).2-194
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